Please enable JavaScript.
Coggle requires JavaScript to display documents.
Atomic Theory - Coggle Diagram
Atomic Theory
John Dalton- Atomic Model (1800)
Atoms make up all matter
Chemical reactions rearrange atoms in relation to each other
Atoms cannot be subdivided into smaller particles
Compounds form when two or more different elements bond together
Atoms of the same element are identical
Atoms of different elements differ
Ernest Rutherford- Nuclear Model (20th Century)
Plum-pudding model is not entirely correct
Atoms have a central nucleus of positive charge which is orbited by negatively charged electrons.
Atoms are mostly empty space
Electrons are located outside the nucleus
Niels Bhor- Planetary Model (20th Century)
Electrons orbit the nucleus similar to how planets orbit the sun.
Electrons can only orbit in specific distances and specific energy.
When gaining energy, electrons move to farther orbit from the nucleus. When losing energy, electrons move to closer orbit from the nucleus.
The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit.
Erwin Schrodinger- Quantum Mechanical Model (1926)
Electrons move around the nucleus in a cloud not orbits.
Electrons exist in specific energy levels as a cloud.
The electron cloud is the region of negative charges, which surrounds the nucleus.
Orbital : The region with a high probability of containing electrons.
J.J. Thompson - Plum-pudding Model (19th Century)
Atoms are maid up of even smaller particles
Atom is a positively charged sphere within which electrons swim
Negatively charged electrons are fixed in the positive sphere